Brake mechanism.



W. C BAKER.

BRAKE MECHANISM.

APPLICATION FILED JAN.7.1915.

Patented Mar. 16, 1915;

" To all whom it may concern:

WAIQTEB c. BAKER, or CLEVELAND, onro, ASSIGNOR To COMPANY, or CLEVELAND, OHIO, A conronn'rron or OHIO.

BRAKE 'mncmms'm.

. Be it known that I, WALTER G. Balms, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in and Relating to Brake Mechanism, of which the following is a specification. 4

Th's invention relates to brake .mechanism, and particularly to that type of.

brake mechanism having a' drum and a plu-- rality of are shaped brake members movable intoand out of engagement with said drum. One object of the invention is to provide a brake mechanism-whichproduces efiicient braking effects upon the application of a. relatively small amount of power.

Another object'of the invention is to provide, in a brake mechanism of this character supporting means which permit the. brake members to accommodate themselves readily and quickly to the drum surface when operated.

Another object of my invention is so to associate and correlatethe parts by means of which'each brake shoe is pivotally supported, that the brake shoe maybe connected to and disconnected from its pivotal mounting simply by movement of the to and fro relative to its mounting. I

Further objects ofthe invention consist shoe of correlating the parts and causing them to co-a'ct] as hereinafter described and claimed. T? I I For the purpose of illustration,,I have,'in the accompanyingdrawings, shown and described one form of .brake mechanism em bo'dying my invention.

Figure 1 is a fragmentary top plan view, partly in section, of a vehicle axle and wheel having a brake mechanism embodying myinvention. Fig. 2 is a section -on the line 2-2 of Fig. 1 looking in the direction of the arrow. Figs. 3 and 4 are fragmentary views illustrating the operation of the expanding mechanism. Figs. 5'and 6 are plan views,

opposlte portion of a pair of brake 'ric ig. i ustrates the manner of conshoe meeting the brake shoes to and disconnecting them from the pivot locks.

arranged between its said sections .9 and 9..

brake shoes, one at either side of the diametrically extending arms 9", 9. As these sets v shapedsections 12, 13. fiTheir adjacent ends ,12, 13', respectively, are provided with tween the bolt head 15 and the'washer 19.

interposed between thewashers 17 and 19 respiitively, of the top portion and diametspecification of Letters Patent. Patented Mar. 16,1915. I A Application filed January 7, 1915. Serial No. 918.

5 is a. driven axle section extending through the axletube 4'and connected with the hub 1 by a clutch tube 1, a cylindricalisection 9, incasing the tube 4. adjacent the: iimer end of the wheel hub, and diametrically opposed arms 9', 9,

' 10 is a packing gland between the inner flange of the wheel hub and the support 9.

'- 11. is 'an' annular closure extending be- I tween the flange 9 and the inner surface of the brake drum 8, so as to practically close the inner end of the brake drum-and prevent-the access of dirt or dust to the brake mechanism in so far as practical manufacturing and operating limits permit.

I have illustrated two'sets or couples of are alike in construction, it will be necessary to' describe but one of them.

Each set of brake shoes comprises two are alined rectangular recesses 12, 13, each arranged to rec'eifve a rectangular slide :1 1 l which is pivotally mounted on a bolt15 which extends through the arm 9. The bolt 15at one end has a head 15. Its other endextends through an openmg 11' in the clo-' sum-11 and carries a nut 16 and washers 18 is a coiled spiral spring interposed be 18 IS a snmlar sprmg These P E pro.

vide for necessary lateral movement in operationof the brake shoes, while tendingto 100 i keep the shoes of both sets in normal posi-r,

tion and to prevent rattling of 'the con-. nected parts. The connection between each ofthebrake shoes and the pivot 15 is such 5 as to permit the oscillation of each sh0'e,

about the axis of the pivot 15 and the bodilymovement of each shoe toand fro relative to said axis;

The ends 12%, 137'- of the brake shoessubstantially diametrically opposite the pivot 'rrm AMERIChN-BAL mime 15 are free to move toward and from each other, They are normally drawn together by means of a spring 20 secured at either end tothe adjacent brakeQshoe. They are expanded into engagement with the inner surface of thedrum through the instrumenvparatus of the class described, many altertality of an 'expan der or cam mechanism? indicateel as an entlrety by 21.- llt consistsof the pivotallymountedshaft "22 carrying a cam 23, the surfaces of which are adaptedto,

- engage with the adjacent end surfaces 12 13' ot the brake shoes 12, 13, respectively.

' l The operating rodj2-2 for the expander for the outermost 4 pair of brake shoes extends through the support or arm 9 in which it is pivotally mounted and loosely through the tubnlarshaft 22 for operating.

the expander for the innermost pair or brake shoes. Any suitable mechanism (not shown) may be employed for, actuating the rods or shafts 22 to rota'te.or oscillate. the

. cams 23 carried thereby, respectively.

\ directions relative" to the drum to insure that when they are operated through the instru-- It will be noted that my construction is such that the brakecshoes of each set are permitted suficient movement in' various mentality of their expanding cam-,they will freely and quickly accommodate themselves so as to engage considerable areas 'ot the interior of the brake'dr'um and that an effective braking action may be had ,with irreletively small angular movement of the cam.

Also, that when the brake shoesare released fromthe drum they are automatically drawn together at" their free ends.

When the brake drum 8 surrouhds the brake shoe'it limits the outward inovement of the brake shoe all directions.

'Ifit isdesired for any reason to remove recess in it clear the Walls of the rectangular block' l l and the brake shoe'is' disconnected.

To those skilled in the art of making apations in construction and widely difiering. embodiments and applications of my invention will suggest themselves, without departing from the spirit and scope thereof.

ltdly disclosures and the description herein I are purely illustrative, and are. not intended to be in any sense limiting. T

What 1 claim-is:

1. in combination, a brake drum, a pair of semicircular brake shoes each having a bearing recess at one end thereofya support for said brake shoes, a pivotal connection between said support and, the walls of said recessesin the'brake shoes Slidiable into and out of said recesses, and means for expandingsaid brake shoes about the axis of said pivotaleonnection into engagement with.

said drum. v A

2. In combination, a brake shoe support having a laterally extending pivot, a brake drlim relative to said pivot, a pair ofs'emi-circular brake shoes, each having a recessto receive said pivot and make connection therewith,

movable to and fro longitudinally and'means for expanding said brake shoeinto engagement with said. drum, whereby when the brake drum is moved out of alineinent with said brake shoes, either of them may bemoved to and fro freely to connect it with or disconnect it from said pivot.

' In testimony whereof I afiix my signature,

in the presence of two witnesses.

WALTER. o. name, Witnesses:

' Farm 0. Donn,

- EDWARD JR. ALEXANDER. 

